When does a larger voltage result in a greater current?

  • Thread starter Thread starter Mycelium
  • Start date Start date
  • Tags Tags
    Current Voltage
AI Thread Summary
The discussion centers on the relationship between voltage, current, and resistance in a circuit, particularly in the context of induced current and changing magnetic flux. It highlights the confusion around Ohm's Law (V = IR), where an increase in voltage should lead to an increase in current, not a decrease, assuming constant resistance. Participants clarify that current is directly proportional to voltage, reinforcing that higher voltage results in higher current. The conversation concludes with an acknowledgment of this intuitive understanding of the relationship between voltage and current. Overall, the discussion effectively resolves the initial confusion regarding induced current and Ohm's Law.
Mycelium
Messages
6
Reaction score
0

Homework Statement



I was looking at a question which asked when the induced current in a circuit was greatest, and this was when the rate of change of magnetic flux was greatest. However, this (seems to )contradicts V = IR. Can anyone explain?

Homework Equations

The Attempt at a Solution

 
Physics news on Phys.org
Mycelium said:
this (seems to )contradicts V = IR.
How?
 
cnh1995 said:
How?
I thought that if we have constant resistance, an increase in voltage would lead to a decrease in current. At least that's how I interpret the equation.
 
Mycelium said:
increase in voltage would lead to a decrease in current.
R=V/I. Increase in voltage increases the current such that V/I is constant. I is in direct proportion with V. That's pretty intuitive, isn't it?
 
cnh1995 said:
R=V/I. Increase in voltage increases the current such that V/I is constant. I is in direct proportion with V. That's pretty intuitive, isn't it?
Yeah, it makes sense thinking about it like that. Thanks [emoji4]
 

Thread 'Errors and significant figures'

I multiplied the values first without the error limit. Got 19.38. rounded it off to 2 significant figures since the given data has 2 significant figures. So = 19. For error I used the above formula. It comes out about 1.48. Now my question is. Should I write the answer as 19±1.5 (rounding 1.48 to 2 significant figures) OR should I write it as 19±1. So in short, should the error have same number of significant figures as the mean value or should it have the same number of decimal places as...
View full post »
Thread 'Collision of a bullet on a rod-string system: query'

Thread 'Collision of a bullet on a rod-string system: query'

In this question, I have a question. I am NOT trying to solve it, but it is just a conceptual question. Consider the point on the rod, which connects the string and the rod. My question: just before and after the collision, is ANGULAR momentum CONSERVED about this point? Lets call the point which connects the string and rod as P. Why am I asking this? : it is clear from the scenario that the point of concern, which connects the string and the rod, moves in a circular path due to the string...
View full post »
Thread 'A cylinder connected to a hanging mass'

Thread 'A cylinder connected to a hanging mass'

Let's declare that for the cylinder, mass = M = 10 kg Radius = R = 4 m For the wall and the floor, Friction coeff = ##\mu## = 0.5 For the hanging mass, mass = m = 11 kg First, we divide the force according to their respective plane (x and y thing, correct me if I'm wrong) and according to which, cylinder or the hanging mass, they're working on. Force on the hanging mass $$mg - T = ma$$ Force(Cylinder) on y $$N_f + f_w - Mg = 0$$ Force(Cylinder) on x $$T + f_f - N_w = Ma$$ There's also...
View full post »

Similar threads

Need some confirmation regarding induced currents
Replies
1
Views
678
Induced EMF due to a moving magnet
Replies
7
Views
805
How does an eddy current brake work exactly?
Replies
2
Views
2K
Modelling a metal detector using eddy currents from Non-Destructive Testing
Replies
1
Views
862
Direction and magnitude of electric field produced by current change
Replies
8
Views
982
AC generator -- Understanding coil voltages as function of position
Replies
1
Views
2K
Determining the Change in Bulb Brightness by Changing Circuit
Replies
6
Views
1K
What Is the Correct Current Equation to Induce Given Flux in a Circuit?
Replies
2
Views
2K
When Voltage is Constant (DC), is current also constant?
Replies
3
Views
1K
Finding the current and voltage for each resistor
Replies
5
Views
2K

Hot Threads

Recent Insights

Back
Top